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Original question:

BQ25750: Can BQ25750 Support Battery Supplying Power to Input (VAC)?

BQ25750: BQ25750 as alternative for BQ25856-Q1

Vidar Myklebust
Prodigy 10 points
Part Number: BQ25750
Other Parts Discussed in Thread: BQ25856-Q1

Tool/software:

I see (from related question) that by shorting SYS to VAC, BQ25750 can supply power from battery to input (VAC). I also see (from documentation) that once the voltage at VAC is within the limits of ACUV/ACOV, the chip will return to forward operation. The reverse voltage I want to set up is within the limits of ACUV/ACOV. Will this cause the chip to immediately return to forward operation once the reverse voltage is set up at VAC?

Using BQ25856-Q1 this is not a problem, but I know these chips are different in that that BQ25750 is designed for direct power path control, while BQ25856-Q1 is not.

The reason I ask despite already having a chip doing what I want (BQ25856-Q1), is that I want, if possible, to define an alternative component for the BOM.

  • +1
    TI__Genius 9830 points

    Hi,

    BQ25750 is designed for direct power path control, but it does not necessarily need to have power path. The ACFETs and the BATFETs are listed as optional in the datasheet. Without the power path FETs, the reverse mode should operate in a similar manner to the BQ25856-Q1 in which reverse mode must be manually turned off to resume forward operation.

    Keep in mind that the BQ25750 is not automotive qualified if that is a factor in choosing the BQ25856-Q1.

    Let me know if you have any further questions about this.

    Best,
    Michael